Portable power-driven rivet spinning and pressing tool



Feb. 19, 1929. 1,102,750

w. STUMPF PORTAB E Pom DRIVEN RIVET sgnmme mnrnsssme' TOOL Filed'oct.15, 1925 ZSheets-Sheet l Patented Feb. 19, 1929'."

UNITED STATES 1,702,750 PATENT OFFICE.

WALTER ST'O'MIPF, OF BALTIMORE COUNTY, MARYLAND, ASSIGNOR TO THE BLACK &DECKER MANUFACTURING COMPANY, OF 'I'OWSON, MARYLAND, A CORPORATION OFMARYLAND.

PORTABLE POWER-DRIVEN RIVET SPINNING AND PRESSING TOOL.

Application filed October 15, 1925. Serial No. 62,637.

The invention relates to manually portable power-driven rotary tools andparticularly to such a tool for use in heading rivets by spinning. Therivets are in accordance with the present practice in rivet spinningordinarily driven cold, though the tool may be applied to hot riveting.

The tool as shown in the present application is provided with anelectric motor connected by suitable gearingto a rotaryspindle which isequipped with a spinning tool adapt ed to engage the point of the rivetand when rotated at the desired speed and applied with a suitable degreeof pressure to so' displace the metal as to upset the rivet point,expanding it laterally and forming a smooth convex head. An importantfeature of the invention is the provision in a tool of the general typedescribed, i. e., a manually portable power-driven rotary tool, of meansfor applying a spinning toolto the rivet or similar member to be upsetas described, with necessary pressure to displace the metal and upset orhead over the point of the rivets.

The means referred to consist of arivet head supporting member, referredto herein as an anvil, and means for forcing the anvil toward thespinning tool and vice versa, compressing the rivet between the anviland spinning tool, the rivet being ordinarily supported laterally by thewalls of the hole through which it is passed in the material beingriveted.

The tool, as shown, is particularlyadapted for use with large work, asthe manufacture of, automobile bodies and the like, which cannot beeasily moved to be engaged by theoperative elements of stationarymachines, and it may be used to advantage in stationary structures andin numerous instances with small work as brake lining and the like.

In the form shown the anvil is mounted on a transverse arm or foot of anL-shaped sliding bar which slides in hearings in theframe orcase of thetool, the motion being parallel .to the, spindle. The sliding bar iscontrolled,

and forced toward the spinning tool by means of a slow motion pressuremultiplying gear shown in the form of a toggle joint controlled by anelongated hand lever.

In the preferred form shown, one link of the. toggle is formed by theend of the lever,

the toggle link being substantially at right angles to the length of theactuating lever.

with the spinning tool, anvil and anvil support and actuating means inelevation. Flgure 3 1s a View looking from the right 1n Figure 2,showing fragmenta-rily the sliding bar and actuating means, the plane ofthe figure intersecting the actuating lever on line 3-3. 3 v

Figure 4 is asection on the line 4.4 of Figure 2 looking upward, showingthe spindle and other parts of the tool except the anv1l in bottom planReferring to the drawings by numerals. each of which is used to indicatethe same or similar parts in the different figures, the machine as shownincludes a motor 1, which is preferable an electric motor, a spindle 2mounted in an elongated bearing 3 inthe tool casing 4, and carrying atits lower end a rivet spinning tool 5. The spindle 3 is driven from themotor 1 by a train of reduca, gear 7 mounted on the frame on a suitableI stud, not shown, and carrying a pinion 9 which meshes with a toothedgear 10 on the spindle. The motor is provided with suitable shaftbearings 11, as shown, and the spin dle 2, in addition to being mountedin an elongated bearing 3, is provided with a thrust bearing 12 in arecess 14 in the frame engaging a suitable flange 15 on the spindle.

It is of particular interest, in the preferred construction shown, thatthe tool casing is provided with a rigid integral extension 16 whichsupports the bearing 3 which extends almost the entire length of thespindle, the exception being the portion occupied by the flange 15 andspinning tool carrier 17. The casing or frame extension also provides asupport for the anvil to be described.

a transverse foot 22 which carries the anvil at one end directly beneaththe spinning tool 5.. The sliding bar 21,. as shown, is of rectangularcross-section, though the shape is not or": particular importance, therectangle being elongated in the direction of the radius of the spindleand is mounted to slide in a bearing slot 23 in the frame, the slot andthe.

direction of motion being parallel to the spindle 2. The slot as shownis open at the end at 24 from which the sliding rod protrudes and forits entire length on the side remote from the spindle, being closed asto this side by a coverplate 25 which is convenientlyremovable and isheld by screws 26 or in any suitable manner. The sliding bar and anvilare actuated by means of a suitable .slow motion pressure multiplyingmechanlsm shown 1n the form of a toggle mecha therein and pivotallyconnected at its upper end at 34 to the laterally expanded end 35 of thelever 31, which acts as the second link of stud seated in the bar.

the toggle, being pivotally connected at 36 to the sliding bar 21 bymeans of a suitable The end 35 of the lever 31 is as will be noted byexamination or Figure 3, mounted in a slot 37 shown also in dotted linesin Figure 2, which provides an opening through the tool casing, exposinga portion of the sliding bar 21 in which the stud 36 is seated, the barand anvil being shown in Figure 2 at the upper or rivet pressingposition. The tool may be referred to in accurate descriptive terms asaportable power-driven rivet spinning and presstool, p e operation willbe easily understood I from the preamble and description. The

handle 31 is first raised to lower the anvil or more properly to spaceit away from the spinnor, and the rivet having been inserted, the worlr.is passed between the anvil andspinnor, the head of the rivet beingengaged with the anvil, being conveniently centered by means or thedepression 38 therein. The

- "handle 31 is then forced down, bringing the rivet pins 33, 34:, 36 ofthe toggle lever into alient and forcing the upper pin 36, Figure 2,which is seated in the sliding'bar 21,

carrying the anvil upward to its uppermost position, in which positionthe anviland the spinner are caused to approach, placing the rivet underlongitudinal compression, forcing the spinning tool against the point ofthe rivet. The motor having been started prefmoat-to erably pribr to thefinal application of pressure, the spinning tool is rotated at a rela-.tively high speed, the friction thus applied by the pressure and highspeed of rotation of the spinning tool serves to gradually displace themetal of the rivet laterally, forming a head or upsetting the rivet in ashape in conlormity to the shape of the spinning tool, which as shownconsists of a pair of rollers 39, presenting as combined a laterallyconcave peripheral face 42, the rollers being mounted to rotate on a pin40 in forks 41 of the spinner tool shank l7.

i The tool, as shown, has important advantages in its application tolarge work where a manually portable tool may be moved to convenientpositions to conform to the shape of the work which cannot itself be asconveniently moved for the purpose of working with a stationary tool,and the tool may be used on stationary work. Q

The construction described has notable ad vantages, particularly in theextension 16 of the frame, which provides an elongated bearing and athrust bearing for the spindle, and a slide bearing integral therewithfor the sliding bar 21 carrying the anvil, giving absolute rigidity ofthe parts in applying pressure to the rivets, and in the compactarrangement whereby the anvil is actuatedby the hand lever 31, applyingsufiicient pressure to the rivet by slight pressure on the hand lever,the entire mechanism being convenient, compact and powerful and capableof operation by unskilled labor, giving the highest degree of efficiencyin the way of speed and perfection of the work produced.

it have thus described specifically and in detail a single embodiment ofmy invention in ,order that the nature and operation of the same may beclearly understood; however, the specific terms herein are useddescriptively rather than in a limitin sense, the scope ol the inventionbeing defined in the claims. i

What it claim and desire to secure by Letters Patent is:

l. A manually portable power-driven tool having amotor, a frame,supporting the motor and having an integral extension, a spindle mountedin the extension and having an elongated bearing therein with gearingconnecting the motor to the spindle, a bearing in the extension parallelto the spindle, a sliding bar mounted therein, means for supporting aspinning tool on the spindle, an anvil mounted-on the sliding bar inalignmentwith the spindle, and means for moving the sliding bar with aslow, pressuremultipl ing motion to compress a rivet be tween t e anviland spinning mechanism.

2. A manually portable power-driven tool having a motor, a casingenclosing the motor and having an integral extension, a spindle mountedin the extension and having an elongated bearing therein with gearingconnecting the motor to the spindle, a bearing in the extension parallelto the spindle, a sliding bar mounted therein, means for supporting aspinning tool on the spindle, an

anvil mounted on the sliding bar in align-' ment with the spindle, andmeans for moving the sliding bar with a slow, pressure-multiplyingmotion to compress a rivet between the anvil and spinning mechanism,said means comprising a toggle mechanism and a hand lever actuating thesame.

3. A manually portable power-driven tool having a motor, a framecarrying the motor and having an integral extension a spindle mounted inthe extension and having an elongated bearing therein with gearingconnecting the motor to the spindle, a sliding bar having a bearing inthe extension parallel to the spindle, means for supporting a spinningtool-0n the spindle, an anvil mounted on the sliding bar, in alignmentwith the spindle, and means for moving the sliding bar with a slow,pressure-multiplying motion tocompress a rivet between the anvil andspinning mechanism, said means comprising a toggle lever composed of twolinks, a hand lever formed integral with one link, a ivot pin connectingthe hand lever to the sliding bar at the upper end of the toggle, a pincona frame carrying the motor and having an integral extension, aspindle having anelongated bearing in the extension, and drivingconnections to the motor, means connecting a rivet spinning tool to thespindle, an anvil, a sliding bar supporting the anvil, a slide bearingfor the bar in the extension parallel to the spindle, the bearing beingopen at one side, a removable cover therefor, a hand lever for actuatingthe sliding bar to compress a rivet between the spinning tool and anvil,and slow motion, pressure-multiplying means controlled by the handle toactuate the sliding bar.

Signed by me at Baltimore, Maryland, this 13th day of October, 1925.

WALTER STUMPF.

